We put good floors, tiles, carpets, blinds, all bedrooms and bathrooms decorated beautifully, really nice lights all over the house and we have decked part of the back garden, still not finished.
Please don't take this as being cheeky or rude - I'm sure it is really lovely - but buyers may not have the same taste and may not see those things as worth 30k.
And if you move, would it cost you 30k again to get the new house the way you like it and looking as nice?
Also, half-finished decking would be a negative, not a positive IMO. I guess you will sort that out before you sell tho.